Door-latch



(Model.)

P. MATHBS.

` DOOR LATCH.

UNITED, STATES PATENT OFFICE.

PHILIPMATHES, OF IDLEWOOD, PENNSYLVANIA.

DOOR-LATCH.

SPECIFICATION forming part of Letters PatentNo. 276,255, dated April 24, 1883.

Application filed November 1S, 1882. (Model.)

To all Vwhom it may concern:

Be it known that I, PHILIP Marlins, of Idlewood Station, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in` Door-Locks;

and I do hereby declare the following to be a` full, clear, and exact description thereof, ret'- erence being had to the accompanying drawing, forming a part of this specitication, in Which- Figure l is a plan viewof my improved lock with the back plate removed. l Fig. 2 is a 1ongitudinal section. Fig. 3 is a vertical section of the barrel and slide. Fig. 4 is a plan View of the slide. y Fig. 5 is a view of the inner side of the back plate. Fig. 6 is a view dt' the key.

Like letters of reference indicate like parts in each.

The case a has a face-plate, a', and a back plate, a2, the faceplate and sides being prefh erably one casting, and the back plate a removable piece. The lock has a barrel, b, which contains the tumblers c, andis slotted at one end, as at b', for the insertion of the key. Bearing` against the lower end of the tumblers are springs c2, which hold the tumblers up in place, so as to restore them to position when the key is removed. `The tumblers are slotted, as at c', for a purpose hereinafter specified. On the barrel b is a cross-piece, b2, which is lngitudinally slotted for the reception of a slide, c, which slide is slotted centrally, as at c,`for the passage throughmit of the tumblers c. On the lower side of the crosspiece or T b2 is a downwardly-projecting pin, i

b3, the purpose of which is to throw the bolt h when the barrel is turned. The bolt h is provided with a plate, lb', slotted, as ath?, for the passage of the lower end of the barrel, and recessed, as atvh3, for the engagement ot' the pin When the barrel is turned the pints, working in the recess h3, throws the bolt in or out, as the case may be. At the side of the plate h is a slde,.cl, moving between guide-lugs d', and having a straight side, cl2, which operates against the cross-bar b2 to throw the barrel either way after the bar b2 has passed the center. -The slide ol is operated by a spring, f, which presses against it in the usual way. Above or below the barrel b is a stop, g, pivoted at g', and held up at the front end by a which, being longer than the bar b2, projects from it ends. On the inner face of the back plate, a2, are `two curved guides, i, which stand at the sides of the opening through which the barrel projects. On the outer side of the back plate, a2, is a tube, a3, designed to contain that portion of the barrel in which the tumblers are placed. When the lock is placed on the door the tube a3 is inserted into the hole bored to receive it. On the other end of the barrel is a knob, a, by which the latch may be turned on the inside of the door, the key end of the barrel projecting through the door and being opened from the outside by the use of a key.

, Thus constructed, the operation of my improvement is as follows: The turning ot' the barrel by means of' a knob or by means of a mist key causes the bar b2 to swing around until the end ofthe slide c strikes against the face of the stop g, which prevents it turning farther, and thus prevents the bolt from being withdrawn and the door opened. Then, if the person is on the inside of the door, the stop g may be thrown out of theiway of the slide e by pressingin the push-button ya. This causes the stop to be thrown to the side of the end ot' the slide e and permits the barrel to turn and to shoot the bolt. As soon as the tin ger is removed from the push-button g5 the spring g2 restores the stop to its proper position, and so locks the bolt either open or shut. Il", however, the person is on the outside and makes use of the propenkey, the insertion of the key presses the tumblers down in the barrel until the slots c therein are all brought together opposite to the slide c. Then as the barrel is revolved by the key the end ot' thel slide e comes in contact with the stop g and -is forced back by the stop into the bar b2, the slots c permitting such movement. After the end of the in contact with one ofthe curved guides i on the inner side of the back plate, a2, and is pushed back again into its normal position inA the bar b2. This also forces the slide out of the slot c in the tumblers and leaves them free to rise in the barrel when the key is withdrawn. Thusit will be seen that when the dooris opened from theinsideitis necessary to use some means for removing the stop from the path of the slide e, and when the door is opened from the outside the insertion ofthe key brings the slots in the tumblers in line, so as to permit the slide e t0 be forced backward by the stop, and that the slide e is restored to its proper position, upon the further rotation of the barrel, by the operation of the curved guides 't'. The curved guides z', or some other similar device, are necessary to restore the slide e to its normal position, as otherwise it would remain standing in the slots c in the tumblers and prevent the tumblers from rising to their normal position.

I do not limit myself to the particular form of stop g shown, as a sliding or other form of stop may be used to accomplish the same purpose. I prefer, however, the form shown, as that is at once cheap and easy to make and is not liable to get out of order, and requires only the pressure of the button to throw it out of the way. Any form of stop which would require to be drawn away from the path of the radially-moving slide e would necessitate two movements of the hand in opening the door, which is obviated by the present construction.

My improved lock is simple and cheap in its construction and ecient in its operation.

Instead of the circular guides, -I can, if desired, use a spring for restoring the slide to its normal position.

What I claim as myinvention, and desire to secure by Letters Patent, is-

1. In a dead-lock, the combination of a rotating barrel having a radial projection with a movable stop arranged in the case at the side of the barrel, and devices for throwing the said stop into and out of the path of said projection, substantially as and for the purposes described.

2. In a dead-lock, the combination of a rotating barrel having a radial slide projecting from its sides, with a movable stop arranged in the case at the side of the barrel and capable of being thrown into and out ot' the path of said slide, for the purpose of forcing the lslide inward, and -devices for restoring the slide to its normal position, substantially as and for the purposes described.

3. In a dead=lock, the combination of a rotating barrel having a radial projection, with a pivoted stop arranged within the case at the side of the barrel and operated from the outside by a push-button and restored to place by a spring, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 13th day of November, A. D. 1882.

PHILIP MATHES.

Witnesses :A

W. B. GORWIN, 'I'. B. KERR. 

